Online Calendars:

One of the more active areas, with offerings from: on the web: plenty of new free calendar services:

• HipCal hipCal (winner of the web2.0awards calendar section),
• BaseCamp basecampHQ (aka backpack),
• upcoming upcoming.org,
• 30 boxes 30boxes.com/
• Google google calendars (they're also doing institutional email trials (free)
• Calendar Hub calendarhub.com/
• Trumba trumba.com/
• Joyent joyent.com/
• Kiko kiko.com/
• Planzo planzo.com/
• Spongecell spongecell.com/
• eventful eventful.com/
• Calendars dot net calendars.net/
• plus Remember the milk rememberthemilk.com/

(Plenty more examples of online applications via web2.0awards.org )

• AirSet AirSet.com
• Backpack Backpackit.com
• Filangy Filangy.com
• Ta-da Lists Tadalist.com
• TagFacts Tagfacts.com
• Tilika Tilika.com
• ZOHO Planner Zohoplanner.com